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JPH08149594

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH08149594
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment and video equipment.
[0002]
2. Description of the Related Art In recent years, there has been a great demand for improvement
in the appearance quality of loudspeakers. Among them, the use of diaphragms made of resin has
been increasing as a design means for meeting these requirements. Based on such background, a
speaker using a conventional resin diaphragm will be described below.
[0003]
FIG. 3 shows a conventional loudspeaker of this type, in which a frame 6 is coupled to an upper
plate 2 of a magnetic circuit 4 configured by sandwiching a magnet 1 by an upper plate 2 and a
lower plate 3. The diaphragm 9 is formed by clamping a cone 7 obtained by injection molding of
a resin by an edge 8 to the peripheral portion of the diaphragm, and the middle portion of the
voice coil 10 for driving the diaphragm 9 is A dust cap 12 is bonded to the central portion of the
diaphragm 9 so as to be held in a central position and fitted in the magnetic gap 5, and a dust
cap 12 is bonded to the upper surface of the diaphragm 9 coupled to the voice coil 10.
[0004]
Further, as another conventional example, as shown in FIG. 4, there is also a type in which a
characteristic correction piece 13 made of sponge, urethane or the like is adhered to the back
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surface of a cone 7 obtained by injection molding resin.
[0005]
However, the conventional speaker using this type of resin diaphragm is very good in appearance
because the material of the cone 7 is a resin, but the physical properties of the material are not
good. It is very difficult to control compared to paper, and there is generally less internal loss
compared to paper. When the diaphragm 9 vibrates, resonance occurs in this cone 7 to disturb
the frequency characteristics, and in severe cases, it is caused by the cone surface noise Poor
quality such as generation of abnormal sound is generated, and these phenomena are often
generated particularly when the weight of the diaphragm 9 is reduced to improve the sound
pressure level.
[0006]
In addition, when viewed as the shape of the speaker, these phenomena often occur in an
elliptical or track type speaker.
[0007]
Furthermore, there are also speakers of the type in which the characteristic correction piece 13
is adhered to the back surface of the cone 7 as shown in FIG. 4 for these measures, but in this
case the cost of the characteristic correction piece 13 and Cost, and the cost increases
significantly, and there is a possibility that the characteristic correction piece 13 may be
dislocated.
[0008]
An object of the present invention is to solve such conventional problems, and to provide a
speaker excellent in frequency characteristics, sound pressure characteristics, and reliability.
[0009]
[Means for Solving the Problems] In order to solve this problem, in the speaker according to the
present invention, the cone portion of the resin diaphragm is molded in two colors by two types
of resin, and unnecessary resonance and surface noise are likely to occur. Is configured to
dispose a resin having a high internal loss.
[0010]
[Function] With this configuration, the occurrence of unnecessary resonance and surface noise
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can be prevented because a resin with a high internal loss is disposed at a portion where
unnecessary resonance or surface noise is likely to occur in the cone portion of the diaphragm. ,
A speaker with excellent frequency characteristics can be realized.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to an
embodiment of the present invention will be described below with reference to the drawings.
[0012]
As shown in FIG. 1, a frame 26 is coupled to an upper plate 22 of a magnetic circuit 24
configured by sandwiching a magnet 21 by an upper plate 22 and a lower plate 23, and formed
by two-color molding using two types of resin. The resin 27A with a high internal loss is placed
in the part where unwanted resonance or surface noise is likely to occur, and a general resin
material 27B such as PP (polypropylene) or PMP (polymethylpentene) is placed in the other part
The diaphragm 29 made of resin and configured such that the formed cone 27 is clamped by the
edge 28 is adhered to the peripheral edge of the frame 26, and the middle portion of the voice
coil 30 for driving the diaphragm 29 is centered by the damper 31 Is coupled to the central
portion of the diaphragm 29 so as to be fitted into the magnetic gap 25 and the coupling portion
between the diaphragm 29 and the voice coil 30 It is constructed by adhering the dust cap 32 to
the surface.
[0013]
Also, in this case, with regard to the resin material of the cone 27, when the same material is
used for the resin material 27A having a high internal loss and the general resin material 27B to
make the internal loss of the resin material 27A having a high internal loss higher. A material
having an effect of increasing internal loss only in this part may be used, for example, a resin
material mixed with ZnO (zinc oxide whisker).
[0014]
Furthermore, as a reverse effect, the internal loss of the resin material 27A with high internal
loss is lower, that is, by using a hard material, the resonance is further enhanced to further
increase the peak value on the frequency characteristic, and this is used as an accent It is also
possible to apply to make the sound of a speaker.
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In this case, there is a method such as mixing glass fiber as a material for reducing the internal
loss.
[0015]
Further, FIG. 2 is a plan view of the diaphragm 29 shown in the above embodiment, and resin
materials different in internal loss from each other are generally resin in positions where the
internal loss does not occur with the resin material 27A having high internal loss. The material
27B is disposed, and is formed by two-color molding by injection molding, and the edge 28 is
adhered to the outer peripheral portion thereof to constitute a diaphragm 29.
[0016]
As described above, according to the present invention, a resin having a high internal loss is
disposed at a portion where unnecessary resonance or surface noise of the diaphragm is likely to
occur by two-color molding to prevent unnecessary resonance or surface noise. Can.
As an opposite effect, it is also possible to lower the internal loss to further enhance the
resonance to further increase the peak value on the frequency characteristic and use it as an
accent to apply it to the sound production of the speaker.
[0017]
Furthermore, there is no quality problem as in the prior art, in which the adhered property
correction pieces come off.
[0018]
Therefore, according to the present invention, the sound pressure level can be improved by
stabilizing the frequency characteristics and reducing the weight of the diaphragm, and quality
problems such as abnormal noise due to cone surface noise and detachment of the characteristic
correction piece can be prevented. It is possible to provide an excellent speaker capable of freely
controlling sound pressure characteristics, and its industrial value is extremely large.
[0019]
Brief description of the drawings
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[0020]
1 is a cross-sectional view showing a speaker according to an embodiment of the present
invention
[0021]
2 is a plan view showing a diaphragm according to an embodiment of the present invention.
[0022]
Fig. 3 A sectional view showing a speaker according to the prior art
[0023]
FIG. 4 is a cross-sectional view showing a speaker according to the conventional example
[0024]
Explanation of sign
[0025]
21 magnet 22 upper plate 23 lower plate 24 magnetic circuit 25 magnetic gap 26 frame 27 cone
27A resin material with high internal loss 27B general resin material 28 edge 29 diaphragm 30
voice coil 31 damper 32 dust cap
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